Authors Referees APS Members |
November 2007, to be published in Physical Review D15
Two-particle Green's functions in the diffusive approximation
The set of equations for the two-particle Green's functions in a non-equilibrium medium is derived in the diffusive approximation. Both the two and single particle Green's functions are calculated when the matter is in the ground state. It is shown that the Landau Fermi-liquid consideration is correct when the interaction between particles in the matter is rather weak or when the matter is not too dense. In the opposite cases the energy spectrum of the particles is rearranged so that the "step" in the momentum distribution of the particles disappears. The applicability of the Landau Fermi-liquid theory is established in the general case. © 2008 The American Physical Society.
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